Big Year 2017

Friday, 13 November 2015

A new Avian Species Record for Barbados – the Western Marsh Harrier (Circus aeruginosus) by Dr. Webster

Photograph by Dr. John Webster

On Thursday 5 November we added yet another species to the
record of avian species seen on Barbados. The new species is the Western Marsh Harrier (Circus aeruginosus). The
photographs presented here represent the photographic record of this sighting.
Unfortunately the photos are not up of the highest quality as Thursday was a
heavily overcast and rainy day with terrible light for photography and most
photos had to be taken into the light. However, they are what they are, a
documentary record of the first sighting in Barbados, of yet another rare
European species for our region.

Photograph by Dr. John Webster

The bird was first seen by me at about 10.00am sitting in a
cow pasture in the Golden Grove area in the eastern part of the island. It then
took flight and for the next 45 minutes circled and hunted over the Golden
Grove private impoundment, hovering at times very low and then regaining
altitude for further circling. The swamp area has become rather overgrown in
recent months with an assortment of sedges, rushes and other vegetation,
thereby creating a habitat similar to that favoured by this species. During the
time it hunted, I never saw it catch any prey.

The following morning Richard Roach and I returned to the
site and once again we observed the Harrier at about 6.30am. It continued its
behaviour as per the day before but never approached close enough for any
decent photos. We have returned to the location several times since but it has
never been seen again.

Photograph by Dr. John Webster

The Western Marsh-Harrier (Circus aeruginosus) is a Eurasian
species rarely recorded in the Western Hemisphere. It appears that there have
only been about 5 previously recorded sightings of this species in the
Caribbean. The first fully documented record
was a female Western Marsh-Harrier, found and photographed at Grand Cul-de-Sac
Marin on the island of Guadeloupe on 14 December 2002 and again on 19 January
2003 by Anthony Levesque and Frantz Delcroix. The second and third records were
a female at the Laguna Cartagena National Wildlife Refuge in Puerto Rico from
14 January to 30 March 2004 and an immature at the same locality from 11
January to 11 February 2006 (Merkord, Rodriguez and Faaborg, Journal of
Caribbean Ornithology 19:42-44, 2006)

). Prior to this
latest sighting in Barbados, two other sightings were recorded in eBird for
this year, both from from Guadeloupe: at
Ilet Christophe, Guadeloupe, Wed Oct 14, 2015 by Gomès Régis and at Baie-Mahault birnhingam, Guadeloupe, Sat Oct
17, 2015 by Frantz Delcroix (Duzont). It is very likely the bird
observed here in Barbados may be the same bird observed on two occasions in
October on Guadeloupe, making its way southward through the chain of islands.

According
to the Hawkand Owl Trust, the Marsh Harrier (Circus aeruginosus) a
large harrier, is making a slow but steady localised recovery from extinction
in the early 19th century. The largest harrier found in the UK, the population
is at its highest for 100 years, but still low and very localised. Since its
recovery the Marsh Harrier has adapted its behaviour, with individuals
wintering in the UK and breeding on farmland as well as traditional reedbed
habitats. Marsh Harriers can be found in large numbers at the Hawk and Owl
Trust’s, Sculthorpe Moor Community Nature Reserve in North Norfolk.

Slightly larger than a Buzzard, Marsh Harriers
can be distinguished by their longer tail, slimmer body and narrower
wings. Females are dark brown with a distinctive cream coloured crown and pale
patches on the forewing and throat. Males have dark wing tips and grey tail,
the breast and head appear yellowish with a brown belly, the upper-wing is a combination
of black, grey and brown. Juveniles are dark brown with a golden crown and
throat and a pale leading edge to the wing. Length: 47-57cm; wingspan:
115-140cm.Status in UK
370 breeding females (2005), increasing but localised; AMBER listed; resident
and summer visitorPopulation Trends
Extinct in the UK by the end of the 19th century due to habitat loss and
persecution, occasional nesting pairs returned to eastern England during the
1970’s. Numbers have increased steadily since then with birds adapting to
different habitats for nesting. Many birds now overwinter and large roosts can
be seen in some areas, especially in eastern England.Habitat
and DistributionMainly found in areas of reed bed, although as
mentioned they also now frequent and breed on farmland. Main populations are in
Norfolk, Kent, Lincolnshire, Humberside, Lancashire and Southern Scotland.Breeding
Originally nesting on the ground in reed beds, Marsh Harriers also nest in
crops. Breeding pairs carry out impressive displays of aerobatics, tumbling
through the air with the male dropping food for the female to catch in mid-air.Females have a single clutch of 4-5 eggs and
start to breed at 3 years of age. Males are not monogamous and will sometimes
mate with 2 or 3 different females.Feeding
Marsh Harriers feed on small mammals and birds, preferring prey that is easier
to catch. They will also take reptiles, insects and carrion.See more of Dr Webster's images below